Allow injecting structured output middleware in backend request manager

[matdev83]

Summary

• allow BackendRequestManager to accept a preconfigured structured output middleware so tests and alternative setups do not have to rely on the global service provider
• add a focused unit test verifying the manager uses the injected middleware instead of resolving it globally

Testing

• python -m pytest tests/unit/core/services/test_backend_tool_preservation.py::test_backend_request_manager_uses_injected_structured_output_middleware -q -o addopts=""
• python -m pytest -o addopts=""

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Codex Task

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📥 Commits

Reviewing files that changed from the base of the PR and between c03159e and e6ceea7.

📒 Files selected for processing (2)

• src/core/services/backend_request_manager_service.py (3 hunks)
• tests/unit/core/services/test_backend_tool_preservation.py (1 hunks)

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch codex/fix-architectural-issues-with-solid-principles

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